Signal Descriptions
Table 3: Signal Descriptions
Symbol Type Description
CLK Input Clock: Each cycle of the clock directs a transfer on the command line and on the data line(s). The
frequency can vary between the minimum and the maximum clock frequency.
RST_n Input Reset: The RST_n signal is used by the host for resetting the device, moving the device to the pre-
idle state. By default, the RST_n signal is temporarily disabled in the device. The host must set ECSD
register byte 162, bits[1:0] to 0x1 to enable this functionality before the host can use it.
CMD I/O Command: This signal is a bidirectional command channel used for command and response trans-
fers. The CMD signal has two bus modes: open-drain mode and push-pull mode (see Operating
Modes). Commands are sent from the MMC host to the device, and responses are sent from the
device to the host.
DAT[7:0] I/O Data I/O: These are bidirectional data signals. The DAT signals operate in push-pull mode. By de-
fault, after power-on or assertion of the RST_n signal, only DAT0 is used for data transfer. The
MMC controller can configure a wider data bus for data transfer either using DAT[3:0] (4-bit mode)
or DAT[7:0] (8-bit mode). e· MMC includes internal pull-up resistors for data lines DAT[7:1]. Immedi-
ately after entering the 4-bit mode, the device disconnects the internal pull-up resistors on the
DAT[3:1] lines. Upon entering the 8-bit mode, the device disconnects the internal pull-ups on the
DAT[7:1] lines.
V
CC
Supply V
CC
: NAND interface (I/F) I/O and NAND Flash power supply.
V
CCQ
Supply V
CCQ
: e· MMC controller core and e· MMC I/F I/O power supply.
V
SS
1
Supply V
SS
: NAND I/F I/O and NAND Flash ground connection.
V
SSQ
1
Supply V
SSQ
: e· MMC controller core and e· MMC I/F ground connection.
V
DDIM
Internal voltage node: At least a 0.1 μF capacitor is required to connect V
DDIM
to ground. A 1 μF ca-
pacitor is recommended. Do not tie to supply voltage or ground.
NC – No connect: No internal connection is present.
RFU – Reserved for future use: No internal connection is present. Leave it floating externally.
Note:
1. V
SS
and V
SSQ
are connected internally.
Micron Confidential and Proprietary
4GB, 8GB, 16GB, 32GB, 64GB: e · MMC
Signal Descriptions
PDF: 09005aef8523ca91
emmc_4gb-64gb_ctrd_441-it.pdf - Rev. B 09/13 EN 5
Micron Technology, Inc. reserves the right to change products or specifications without notice.
? 2013 Micron Technology, Inc. All rights reserved.
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